<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        show-icon
        center
        :closable="false">
      </el-alert>

      <!-- 进度条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab 栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
        label-width="100px" label-position="top">
       <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave"
        @tab-click="tabClicked">
         <el-tab-pane label="基本信息" name="0">
           <el-form-item label="商品名称" prop="goods_name">
             <el-input v-model="addForm.goods_name"></el-input>
           </el-form-item>
           <el-form-item label="商品价格" prop="goods_price">
             <el-input v-model="addForm.goods_price" type="number"></el-input>
           </el-form-item>
           <el-form-item label="商品重量" prop="goods_weight">
             <el-input v-model="addForm.goods_weight" type="number"></el-input>
           </el-form-item>
           <el-form-item label="商品数量" prop="goods_number">
             <el-input v-model="addForm.goods_number" type="number"></el-input>
           </el-form-item>
           <el-form-item label="商品分类" prop="goods_cat">
             <!-- 级联选择器 -->
             <el-cascader
              v-model="addForm.goods_cat"
              :options="goodsTypeList"
              :props="cateProps"
              @change="handleChange"></el-cascader>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品参数" name="1">
           <!-- 渲染表单的Item项 -->
           <el-form-item :label="item.attr_name" v-for="item in manyTableData" 
            :key="item.attr_id">
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox v-for="(cb, i) in item.attr_vals" :key="i" 
                :label="cb" border></el-checkbox>
            </el-checkbox-group>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品属性" name="2">
           <el-form-item v-for="item in onlyTableData" :key="item.attr_id" 
            :label="item.attr_name">
            <el-input v-model="item.attr_vals"></el-input>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品图片" name="3">
           <!-- action 表示图片要上传到的后台API地址 -->
           <el-upload
            :action="uploadURL"
            :on-preview="handlePreview"
            :on-remove="handleRemove"
            list-type="picture"
            :headers="headerObj"
            :on-success="handleSuccess">
            <el-button size="small" type="primary">点击上传</el-button>
          </el-upload>
         </el-tab-pane>
         <el-tab-pane label="商品内容" name="4">
           <!-- 富文本编辑器 -->
           <quill-editor v-model="addForm.goods_introduce"></quill-editor>
           <!-- 添加商品 -->
           <el-button type="primary" style="margin-top:10px" @click="add">添加商品</el-button>
         </el-tab-pane>
       </el-tabs>
      </el-form>
    </el-card>

    <!-- 预览图片窗口 -->
    <el-dialog
      title="图片预览"
      :visible.sync="picDialogVisible"
      width="50%">
        <div>
          <img :src="picUrl" class="previewImg">
        </div>
    </el-dialog>
  </div>
</template>

<script>

import _ from 'lodash'

export default {
  data(){
    return{
      activeIndex: '0',
      // 商品分类列表
      goodsTypeList: [],
      // 动态参数列表数据
      manyTableData: [],
      // 商品属性数据
      onlyTableData: [],
      // 上传图片的URL
      uploadURL: 'http://timemeetyou.com:8889/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {Authorization: window.sessionStorage.getItem('token')},
      // 预览图片地址
      picUrl: '',
      // 预览图片开关
      picDialogVisible: false,
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 添加商品图片的参数
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 校验规则
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称', trigger: 'blur'}
        ],
        goods_price: [
          {required: true, message: '请输入商品价格', trigger: 'blur'}
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量', trigger: 'blur'}
        ],
        goods_number: [
          {required: true, message: '请输入商品数量', trigger: 'blur'}
        ],
        goods_cat: [
          {required: true, message: '请选择商品分类', trigger: 'change'}
        ]
      },
      cateProps:{
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      }
    }
  },
  created(){
    this.getCateList()
  },
  methods:{
    async getCateList(){
      const {data: res} = await this.$http.get('categories')
      if(res.meta.status !== 200){
        return this.$message.error('获取商品分类失败')
      }
      console.log(res.data)
      this.goodsTypeList = res.data
    },
    // 级联选择器选中项变化，会触发这个函数
    handleChange(){
      console.log(this.addForm.goods_cat)
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName){
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked(){
      // console.log(this.activeIndex)
      // 证明访问的是动态参数面板
      if(this.activeIndex === '1'){

        const {data: res} = await this.$http.get('categories/' + this.cateID +'/attributes',
        {params:{sel: 'many'}})
        if(res.meta.status !== 200){
          return this.$message.error('商品参数获取失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        });
        this.manyTableData = res.data

      }else if(this.activeIndex === '2'){// 商品属性

        const {data: res} = await this.$http.get('categories/' + this.cateID +'/attributes',
        {params:{sel: 'only'}})
        if(res.meta.status !== 200){
          return this.$message.error('商品参数获取失败')
        }
        this.onlyTableData = res.data
        console.log(res)
      }
    },
    // 处理图片预览效果
    handlePreview(file){

      this.picUrl = file.response.data.url
      
      this.picDialogVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file){
      console.log(file)
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)

    },
    // 监听图片上传成功的事件
    handleSuccess(response){
      console.log(response)
      // 1. 拼接得到一个图片信息对象  pic 是从后台返回的参数中命名的
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品事件方法
    add(){
      this.$refs.addFormRef.validate(async valid => {
        if(!valid){
          return this.$message.error('必填项为空')
        }
        // 执行添加的业务

        // lodash  cloneDeep(obj) 深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        

        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals}
          this.addForm.attrs.push(newInfo)
        });

        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
          this.addForm.attrs.push(newInfo)
        });

        form.attrs = this.addForm.attrs
        console.log(form)

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const{data: res} = await this.$http.post('goods',form)
        if(res.meta.status !== 201){
          return this.$message.error('添加商品失败')
        }

        this.$message.success('添加商品成功')
        // 编程式导航
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateID(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>

.el-checkbox{
  margin: 5px 10px 0 0 !important;
}

.previewImg{
  width: 100%;
}

</style>